*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a{
    text-decoration: none;
    color: black;
}

li{
    list-style: none;
}
/* 导航栏 */
.nav ul li{
    line-height: 90px;
}

.nav ul li a::after{
    content: "";
    position: relative;
    left: 0px;
    display: block;
    width: 100%;
    height: 2px;
    background: #000;
    bottom: 30px;
    border-radius: 5px;
    transform: translateY(10px);
    opacity: 0;
    transition: .5s ease;
}

.nav ul li a:hover::after{
    transform: translateY(0);
    opacity: 1;
}

.left{
    float: left;
    width: 100px;
    height: 100px;
    /* border: 1px solid #000; */
}

.left img{
    width: 100px;
    height: 100px;
}

.right{
    float: right;
    margin-right: 100px;
}

.right a{
    color: black;
    font-size: 22px;
    font-weight: 800;
}

/* footer部分 */
.footer{
    width: 100%;
    height: 200px;
    padding-top: 65px;
    background-color: #333333;
}

.footer .db_bottom{
    color: white;
    text-align: center;
    margin-top: 15px;
}